It all depends on the manufacturing year...a bat with a stick Wiffle logo and Made in the USA below was manufactured somewhere between 1982 to the mid 90's and in good condition sell for $10 - $50 depending upon the solidity of the bat, with the vast majority being in the lower range.
Those with just a stick Wiffle without the made in the USA predate this area and in good condition could be worth upwards of $100 to a serious Wiffle ball player.
The older the bat the more solid it is and the less it will warp and get out of shape with use - plus generally they are a little heavier and can hit the ball farther.
50 dollars as an very antique item
The wiffle ball was invented by David Mullany, when he tried to make a ball for his son that curved. When his son swung and missed the ball he said that he "whiffed." For more information, click on the link below.
The approximate weight of a wiffle ball is 20 grams. The wiffle ball is approximately 7.2 cm in diameter also.
a wiffle ball
I don't know if this is the sport you are looking for, but the Wiffle ball was first sold in 1953. http://www.wiffle.com/welcome.htm
Wiffle Ball is a variation of the sport of Baseball, designed for indoor or outdoor play in confined areas. Invented by David Mullany in 1953
There is one hole in a wiffle ball. If two openings meet at the same point, then it constitutes as one hole (i.e. a straw has one hole). Since every opening on a wiffle ball meets at the same point in the middle of the ball, there is one hole in a wiffle ball.
Wiffle Ball - 2008 was released on: USA: 8 May 2008 (Delray Beach Film Festival)
wiffle ball
Wiffle ball
david mullany
wiffle ball... soft ball... soccer
most likely a basketball